return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: HF/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C*V 1Σ
Energy calculated at HF/6-31G
 hartrees
Energy at 0K-168.479118
Energy at 298.15K-168.478636
Nuclear repulsion energy77.434301
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at HF/6-31G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σ 3666 3310 79.53      
2 Σ 2624 2369 63.81      
3 Σ 2347 2119 0.09      
4 Σ 950 858 0.09      
5 Π 927 837 65.94      
5 Π 927 837 65.94      
6 Π 576 520 7.34      
6 Π 576 520 7.34      
7 Π 259 234 0.00      
7 Π 259 234 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 6555.9 cm-1
Scaled (by 0.9029) Zero Point Vibrational Energy (zpe) 5919.3 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at HF/6-31G
B
0.15356

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-31G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.889
C2 0.000 0.000 0.742
C3 0.000 0.000 -0.636
C4 0.000 0.000 -1.829
H5 0.000 0.000 -2.883

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.14752.52503.71804.7724
C21.14751.37752.57043.6249
C32.52501.37751.19292.2474
C43.71802.57041.19291.0545
H54.77243.62492.24741.0545

picture of Cyanoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 C3 180.000 C2 C3 C4 180.000
C3 C4 H5 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.176      
2 C 0.194      
3 C -0.091      
4 C -0.332      
5 H 0.405      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -4.129 4.129
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.752 0.000 0.000
y 0.000 -22.752 0.000
z 0.000 0.000 -21.712
Traceless
 xyz
x -0.520 0.000 0.000
y 0.000 -0.520 0.000
z 0.000 0.000 1.040
Polar
3z2-r22.080
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.715 0.000 0.000
y 0.000 1.715 0.000
z 0.000 0.000 8.911


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000